Murray Stahl - 04 Mar 2026 Form 4/A - Amendment Insider Report for MIAMI INTERNATIONAL HOLDINGS, INC. (MIAX)

Role
Director
Signature
/s/ Jay Kesslen, attorney-in-fact
Issuer symbol
MIAX
Transactions as of
04 Mar 2026
Net transactions value
+$312,336
Form type
4/A - Amendment
Filing time
06 Mar 2026, 17:52:47 UTC
Date Of Original Report
05 Mar 2026
Previous filing
04 Mar 2026
Next filing
06 Mar 2026
SEC
View on sec.gov

Reporting Owners (2)

Name Relationship Address Signature Signature date CIK
STAHL MURRAY Director 470 PARK AVE S, 8TH FLOOR SOUTH, NEW YORK /s/ Jay Kesslen, attorney-in-fact 06 Mar 2026 0001207097
HORIZON KINETICS ASSET MANAGEMENT LLC 10%+ Owner 470 PARK AVE S, 8TH FLOOR SOUTH, NEW YORK /s/ Jay Kesslen, attorney-in-fact 06 Mar 2026 0001056823

Transactions Table

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Ownership Footnotes
transaction MIAX Common Stock Purchase $312,336 +7,200 +0.16% $43.38 4,626,642 04 Mar 2026 Horizon Kinetics Asset Management LLC F1, F2

Derivative Securities (e.g., puts, calls, warrants, options, convertible securities)

Type Sym Class Transaction Value $ Shares Change % * Price $ Shares After Date Underlying Class Amount Exercise Price Ownership Footnotes
holding MIAX Options 7,500 04 Mar 2026 Miami International Holdings Inc 7,500 $16.14 Direct F3
holding MIAX Options 10,000 04 Mar 2026 Miami International Holdings Inc 10,000 $25.98 Direct F3
holding MIAX Options 14,331 04 Mar 2026 Miami International Holdings Inc 14,331 $19.84 Direct F3
holding MIAX Options 2,500 04 Mar 2026 Miami International Holdings Inc 2,500 $16.14 Direct F3
* An asterisk sign (*) next to the price indicates that the price is likely invalid.

Explanation of Responses:

Id Content
F1 Murray Stahl serves as Chairman, Chief Executive Officer, and Chief Investment Officer of Horizon Kinetics Asset Management LLC ("HKAM"), which manages funds and accounts (the "Managed Accounts") that hold securities of the Issuer. Mr. Stahl does not exercise investment discretion with respect to the securities of the Issuer that are beneficially owned by the Managed Accounts. Mr. Stahl disclaims beneficial ownership over the securities reported, except to the extent of his pecuniary interest therein, if any. The filing of this Form shall not be deemed an admission that the Mr. Stahl is the beneficial owner of such securities for purposes of Section 16 or any other purpose.
F2 This amendment corrects a previous filing that incorrectly listed the amount of securities beneficially owned.
F3 The Options given to Mr. Stahl are fully vested.